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MCQs

Total Questions : 28 | Page 1 of 3 pages
Question 1.  The ________ circuit overcomes the problem of switching caused by jitter on the inputs.
  1.    astable multivibrator
  2.    monostable multivibrator
  3.    bistable multivibrator
  4.    Schmitt trigger
 Discuss Question
Answer: Option D. -> Schmitt trigger
Question 2.  A 0.01-F capacitor is recommended by TTL manufacturers for ________ the power supply.
  1.    decoupling
  2.    filtering
  3.    rectifying
  4.    grounding
 Discuss Question
Answer: Option A. -> decoupling
Question 3.  Which of the following circuit parameters would be most likely to limit the maximum operating frequency of a flip-flop?
  1.    setup and hold time
  2.    clock pulse HIGH and LOW time
  3.    propagation delay time
  4.    clock transition time
 Discuss Question
Answer: Option C. -> propagation delay time
Question 4.  Why would a delay gate be needed for a digital circuit?
  1.    A delay gate is never needed.
  2.    to provide for setup times
  3.    to provide for hold times
  4.    to provide for setup times and hold times
 Discuss Question
Answer: Option D. -> to provide for setup times and hold times
Question 5.  A Schmitt trigger has VT+ = 2.0 V and VT– = 1.2 V. What is the hysteresis voltage of the Schmitt trigger?
  1.    0.4 volt
  2.    0.6 volt
  3.    0.8 volt
  4.    1.2 volts
 Discuss Question
Answer: Option C. -> 0.8 volt
Question 6.  The main concern when using a pull-down resistor is:
  1.    the low power dissipation of the resistor
  2.    it will keep a floating terminal LOW
  3.    the high power dissipation of the resistor
  4.    it will cause false triggering
 Discuss Question
Answer: Option C. -> the high power dissipation of the resistor
Question 7.  Why is the Schmitt trigger needed in the 60-Hz TTL-level clock pulse generator?
  1.    to provide a triangle wave
  2.    to provide a sine wave
  3.    to provide a rounded pulse waveform
  4.    to provide a sharp pulse waveform
 Discuss Question
Answer: Option D. -> to provide a sharp pulse waveform
Question 8. . A Schmitt trigger:
  1.    has two trip points
  2.    is a zero crossing detector
  3.    has positive feedback
  4.    has two trip points and positive feedback
 Discuss Question
Answer: Option D. -> has two trip points and positive feedback
Question 9. .  Setup time specifies:
  1.    the minimum time the control levels need to be maintained on the inputs prior to the triggering edge of the clock in order to be reliably clocked into the flip-flop
  2.    the maximum time interval required for the control levels to remain on the inputs before the triggered edge of the clock in order for the data to be reliably clocked out of the flip-flop
  3.    how long the operator has to get the flip-flop running before the maximum power level is exceeded
  4.    how long it takes the output to change states after the clock has transitioned
 Discuss Question
Answer: Option A. -> the minimum time the control levels need to be maintained on the inputs prior to the triggering edge of the clock in order to be reliably clocked into the flip-flop
Question 10. . 
The purpose of a pull-up resistor is to keep a terminal at a ________ level when it would normally be at a ________ level.
  1.    LOW, float
  2.    HIGH, float
  3.    clock, float
  4.    pulsed, float
 Discuss Question
Answer: Option B. -> HIGH, float

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